Question

it takes 3 hours to print a local newspaper using for printers;how long will it takes six printers to print the newspaper?

Answer 1

If it takes 3 hours to print a local newspaper using four printers, it means that each printer takes 3 x 4 = <<3*4=12>>12 hours to print the newspaper alone.
Therefore, with six printers, it will take a total of 12 / 6 = <<12/6=2>>2 hours to print the newspaper. Answer: \boxed{2}.